fs/9p: Add hardlink support to .u extension

For regular file and directories we put the link
count in th extension field in a tagged string format.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index d3d3c3c..5fe45d6 100644 (file)
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -887,6 +887,8 @@ v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
        struct super_block *sb)
 {
        char ext[32];
+       char tag_name[14];
+       unsigned int i_nlink;
        struct v9fs_session_info *v9ses = sb->s_fs_info;
 
        inode->i_nlink = 1;
@@ -902,7 +904,22 @@ v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
                inode->i_uid = stat->n_uid;
                inode->i_gid = stat->n_gid;
        }
-
+       if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
+               if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) {
+                       /*
+                        * Hadlink support got added later to
+                        * to the .u extension. So there can be
+                        * server out there that doesn't support
+                        * this even with .u extension. So check
+                        * for non NULL stat->extension
+                        */
+                       strncpy(ext, stat->extension, sizeof(ext));
+                       /* HARDLINKCOUNT %u */
+                       sscanf(ext, "%13s %u", tag_name, &i_nlink);
+                       if (!strncmp(tag_name, "HARDLINKCOUNT", 13))
+                               inode->i_nlink = i_nlink;
+               }
+       }
        inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
        if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
                char type = 0;